exam Maths Puzzle Numerical Ability

Hi Can I have some help with variations?

Boyle's Law states that the pressure P of a sample of gas is directly proportional to the temperature T and inversely proportional to th

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exam Other Question

What is the formula for sound measured in decibals? pick a sound,give decibals of the sound and explain what this measurment means? Three coins are tossed . Find the probability that no more than one coin lands heads up. is it 5/8, 1/4, 3/8, or 1/2

How do I work this out?

Please help

Ellen